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#1
Old 03-07-2012, 09:44 PM
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I got some 100% isopropyl alcohol. Any precautions vs the 70% stuff I normally use?

Bottles of this fuel additive were on sale at my local thrift for 50 cents each. Looking at the spec sheet It appears to be that rare beast, 100% isopropyl alcohol. I normally use the 70% rubbling alcohol for a variety of things like cleaning my glasses, killing ants, as disinfectant, or simply rubbing on my head after a tight buzz down with electric clippers.


Can I use this the same way?

Last edited by astro; 03-07-2012 at 09:45 PM.
#2
Old 03-07-2012, 09:58 PM
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I think it is much more flammable, but that's not meant to be quantitative. Both are flammable, but I think that the 70% has a lower vapor pressure so it has lower fumes to ignite. It has a lower flash point.
#3
Old 03-07-2012, 10:05 PM
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It will make you go blind 30% faster?
#4
Old 03-07-2012, 10:26 PM
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Quote:
Originally Posted by Motorgirl View Post
It will make you go blind 30% faster?
That's ethanol. But isopropyl alcohol ain't good drinks, either.
#5
Old 03-07-2012, 10:43 PM
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Quote:
Originally Posted by pulykamell View Post
That's ethanol. But isopropyl alcohol ain't good drinks, either.
I believe you mean methanol.
#6
Old 03-08-2012, 12:20 AM
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Originally Posted by Inner Stickler View Post
I believe you mean methanol.
I did indeed.
#7
Old 03-08-2012, 01:21 AM
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To actually answer your question, yes you treat it just like the 70% stuff. The only difference is there's less water in the 100% vs the 70%.
#8
Old 03-08-2012, 03:44 AM
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Quote:
Originally Posted by Motorgirl View Post
It will make you go blind 30% faster?
Since we're all picking nits, I believe you actually mean about 42.857% (= (100% - 70%) 70%) faster.
#9
Old 03-08-2012, 07:34 AM
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70% is more effective at disinfection

Ironically, the 100% is not as effective in killing germs as the 70% is

http://wiki.answers.com/Q/Why_is_70_...ercent_alcohol
#10
Old 03-08-2012, 08:26 AM
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Quote:
Originally Posted by psychonaut View Post
Since we're all picking nits, I believe you actually mean about 42.857% (= (100% - 70%) 70%) faster.
It's even worse than I feared.
#11
Old 03-08-2012, 11:11 AM
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I used 99.9% pure isoproply alcohol daily for about 25 years when I was a high speed rotary lithographic printing press operator. We treated it just like the 70% stuff you get at the store. It will be a little more flamable than the 70% but that is just about the only difference.
Peace
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#12
Old 03-08-2012, 04:16 PM
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nm, wrong thread.

Last edited by Musicat; 03-08-2012 at 04:16 PM. Reason: never mind
#13
Old 03-08-2012, 05:08 PM
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It will only be 100% as long as the bottle is unopened. As soon as you open the bottle, the percentage will start decreasing.
#14
Old 03-10-2012, 01:51 PM
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Among people who fix electronics, near 100% IA is preferred as a cleaner over 70% (or heaven forbid rubbing alcohol). So you can buy it at electronics parts stores and the like. Stuff like this. The less water the better, but it costs a lot of money to get it out once you get to 99%.

I.e., for electronics, the less water the better. So anti-hazardous in some sense in this context.

I don't think it's especially hazardous compared to 90% IA, which you can get at a lot of places like better stocked drug stores.
#15
Old 03-11-2012, 01:24 AM
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You could always mix it with a bit of water to get back to the stuff you are used to.
#16
Old 03-11-2012, 03:25 AM
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If left open or unsealed it will draw water from the air and get lower in %.

It might well be hasher on your skin. I suggest you do not use it for topical uses.
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#17
Old 03-11-2012, 07:07 AM
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That's four sure. Anything over 70% in a sore or cut would damage the area.

These days, wound care centers strongly discourage using rubbing alcohol or peroxide on sores. They can interfere with healing and even make it deeper.

A close friend works in a wound care center. They get patient referrals all the time from small town doctors that had used the old methods of peroxide and rubbing alcohol to clean a wound daily. Months later they finally refer them to this wound care center in our state capital. Some of these diabetics have wounds almost to the bone.

Rubbing alcohol is fine for cleaning and disinfecting a fresh cut or scrape. After that, the wound should only be cleaned with sterile water.
Quote:
Originally Posted by DrDeth View Post
If left open or unsealed it will draw water from the air and get lower in %.

It might well be hasher on your skin. I suggest you do not use it for topical uses.

Last edited by aceplace57; 03-11-2012 at 07:12 AM.
#18
Old 03-11-2012, 11:40 AM
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it's an all depends.

some things might be adversely affected by a stronger concentration of alcohol.

cleaning might also not be as effective for things that dissolve in water. a dilute solution gives both the water and alcohol properties to work.

as mentioned where water might damage an object then using the least water content is best to evaporate to dryness quickly.
#19
Old 03-11-2012, 12:36 PM
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Although this fuel additive stuff might be 100% isopropyl alcohol in the sense of not containing any significant amount of water, I would not be confident that, given its intended purpose, it is otherwise as pure as the pharmaceutical stuff. Purifying chemicals tends to be expensive, and is only generally done to to the extent necessary for the intended use. It might well contain small amounts of impurities (or even substances deliberately included to boost its performance as a fuel additive) that are toxic.

As I said above, the fact that it is 100% is not really relevant to its pharmaceutical usefulness, even if it is the case that 100% stuff is strong enough to burn you, because you could always and easily dilute it with tap water down to 70% before using it, but the possible presence of other more toxic impurities ought to be born in mind, I think.

Last edited by njtt; 03-11-2012 at 12:41 PM.
#20
Old 03-15-2015, 09:41 PM
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You could make it 70% if you want

The concentration could be diluted if you wish, basically it quite simple add water 30% of the volume of the container (bottle). In other words you got all you need to change the concentration of the Alcohol to whatever concentration all by simply diluting (adding water).
#21
Old 03-15-2015, 10:07 PM
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Quote:
Originally Posted by Mostafa Ghayad View Post
The concentration could be diluted if you wish, basically it quite simple add water 30% of the volume of the container (bottle). In other words you got all you need to change the concentration of the Alcohol to whatever concentration all by simply diluting (adding water).
Yeah, that was mentioned three years ago in post 15...
#22
Old 03-15-2015, 10:19 PM
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Quote:
Originally Posted by Motorgirl View Post
It will make you go blind 30% faster?
I know it's a zombie, but this is a common misconception. Isopropyl alcohol is of similar toxicity to ethanol. It wouldn't taste great, but you could drink it in your cocktails instead of ethanol and be fine.
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